$(10$ pts$).$ SH $6$ in Bryan has two northbound $($NB$)$ lanes with capacity of $1650$ vphpl$.$ During the PM peak, the flow rate is typically $1890$ vph over the two NB lanes. A crash occurs blocking one of the NB lanes for $20$ minutes. After $20$ minutes, the capacity of the freeway is fully restored.

a$.$ Draw a queuing diagram that shows the buildup and dissipation of the queue?

b$.$ At approximately what time $($to the nearest minute$)$ does the queue dissipate? Locate this point on your diagram.

c$.$ What is the longest vehicle queue? What is the longest vehicle delay? Show these events on your diagram.

d$.$ Estimate how much total vehicle delay will occur because of the crash.